Tool-holder



I. DROWNS.

TOOL HOLDER.

1,375,785, Y I Patented Apr. 26,1921. 34 6.? 3.5 3.94 ea I; 3/ T J0 Z I 40 /7 r /;9 7? [will UNITED STATES PATENT OFFICE.

IRVIN DROWNS, OF CANTON OHIO, ASSIGNOR TO THE TIMKEN ROLLER BEARING COMPANY, OF CANTON, OHIO, A CORPORATION OF OHIO.

TOOL-HOLDER.

Specification of Letters Patent.

Patented Apr. 26, 1921.

jects to provide for the adjustment bf the tool at an angle relative to the longitudinal axis of the work so as to vary the taper of tapered or conical articles without having to. resort to a plurality of different tools and holder itself.

The invention consists in a tool-holder for screw machines provided with means for adjusting the tool so that the angle or taper ,body member 11 on the pivot bolt 12 is of the tool with respect to the work may be varied. The invention further consists in the arrangements and'combinations of parts hereinafter described and claimed.

In the accompanying drawing, which forms part of this specification and wherein like symbols refer to like parts wherever they occur,

Figure 1 is a side elevation of the toolholder, showing the work in position between the work support and a finishing tool, the upper portion of the tool-holder being shown in section. to disclose the means for adjusting the angle of the finishing tool with respect to the work support;

Fig. 2 is a side elevation of the toolholder shown in Fig. 1;

Fig. 3 is a rear view of the tool-holder, the lower portionof the same being broken y;

Fig. 4 is a top plan view of the toolholder;

F-ig. 5 is a side elevation of the tool-holder and support shown in Fig. 1, the tool-holder being shown provided with a burnishing tool; and

Fig. 6 1s a front elevation of the tool- ;"holder shown in Fig. 5.

The tool-holder shown in Figs. 1 to 6 of the accompanying drawing is of a well known type and comprises a supporting arm 10 having a swinging body member 11 pivotally mounted on a pivot bolt 12 between bifurcated end portions 13. The supporting arm 10 of the tool-holder is usually held without having to adjust the tool-- in a slot in one of the top-working tool slides of the screw machine (not shown). The pivot bolt 12 has a swivel block 15 on its body portion which fits in an elongated slot 16 formed in the pivoted body portion 11 of the tool-holder, the swivel'block being shorter than the slot in which it slides. This arrangement permits adjustment of the swinging member 11 of the tool-holder with respect to the supporting arm 10. This adjustment is accomplished by means of two screws 17 and 18, which are threaded into the body member 11 of the tool-holder and bear against the squared opposite ends of the swivel block 15. The adjusting screws 17 and 18 are provided with block nuts 19 for holding the swinging body member 11 of the tool-holder in the desired ad-' justed position.

The swinging or pivotal movement of the '24 which is threaded into the end of the bore' in which the plunger 21 and the coil spring 22 are located. This spring and stop arrangement allows the body member 11 to yield slightly, giving it a slight amount of flexibility and permitting it to accommodate itself to the work and thus making it unnecessary to set the tool-holder accurately.

The'tool-holder is provided with a work support in the form of a-ta-pered or conical roller 25, which is journaled between the bifurcated end portion of a bracket arm 26. This bracket arm is adjustably secured to the bottom of the swinging member 11 of the tool-holder by means ofa cap-screw 27 which works in a slot 28 in the bracket and is threaded into the base of the swinging member 11.

The tool-holder proper comprises a tool block 29 which is' secured by means of a cap-screw 30 to the front face of the reduced upper portion of the swinging member 11. The reduced upper -port1on of the swinging member 11 IS in. the form of a post 11 of rectangular section and is provided with an elongated slot 31 through which the cap-screw 30 projects. The body portion of the cap-screw 30 is provided with a hardened steel roller 32 which fits the slot .31 and prevents movement of the cap-screw crosswise of the. slot. The movement of the cap-screw 30 away from the roller support 25 is provided by means of a screw 33 which engages the roller 32 on the cap-screw 30 and is provided with a lock nut 34 for clamping it 'in position.

A tool in the form of a shaving or finishing tool 35 is shown secured to the underside of the tool block 29 by means'of a capscrew 36. The under surface of the tool 35 tapers in the direction of the longitudinal axis of the supporting roller 25 and is channeled as at 37 to produce the conical or tapered roll 38 formed on the end of the stock B, as shown in Fig. 2.

The tool block 29 is provided with a side flange 39 which projects rearwardly from the rear face of the tool block along the side of one of the side faces of the reduced upper portion of the swinging member 11 of the tool-holder. Two set screws 40 are threaded into the side flange 39 of the tool block 29, the screws being equally spaced on opposite sides of the cap-screw 30 which secures the tool block to the swinging member 11.. The inner ends of these screws 40 are adapted-to engage the adjacent side face of the swinging member 11 for the purpose of adjusting the taper of the cutting edge of the tool 35 with relation to the supporting roller 25.

The tool-holder shown in Figs. 5 and 6 of the drawing is the same as the one shown in Figs. 1 to 4 except that a tool block 29- provided with a burnishing .roller 35 is substituted for the tool block 29 and the shaving tool 35 shown in Figs. 1 to 4:. The tool block 29 is provided with a side flange 39*, which projects rearwardly from one of its sides and at right angles to its rear face, and the adjusting screws 40 are threaded into the flange 39 and engage the side face of the swinging member 1 1 in the manner previously describe i With t is arrangement, the angle of inclination of the tools 35 and 35 with relation to the supporting roller 25 may be va-- ried b manipulating the adjusting screws 4O. Vl hen the upper screw 40 is tightened, its inner end engages the side of the swinging member 11 and forces the upper por tion of the flange 39 of the tool block away from the swinging member 11. This action causes the tool block to swing or rotate about the cap-screw 30, thus increasing the angle between the shaving tool or burnishing roll and the supporting roller, while the tightening of the other adjusting screw 40 causes the action to be reversed, thus decreasing the justable tool block for use in connection with tool-holders havangle between the tool and the supp g roller. 1

This arrangement permits the angle between the tool and the supporting roller to be varied slightly and thus makes it unnecessary to place a new tool in the tool-holder when it is desired to vary the taper of the articles being made.

The particular form of tool-holder and the particular form of tools and work support are shown by way of examples, and I do not wish to be limited thereto, the adbeing equally adapted ing other forms of What I claim is:

l. tool-ho lde'r for screw machines and the like comprising a supporting arm and a body member adjustably mounted therein, a roller support adjustably mounted on said body member, a tool block mounted on an ad ustable pivot in said body member and adapted to hold a tool detachably secured thereto, said tool block having a flange extending around one side of said body member, and adjusting screws arrangedfon opposite sides of said adjustable pivot, said ad usting screws being threaded into the flange of said tool block and being adapted to bear against the adjacent face of said. body member whereby adjustment of one or the other of said screws will cause the tool block to swing on its pivot and change the angle between said tool and said work sup,- port. 2. tool-holder for screw machines and the like comprising a body member, a tool block mounted on a pivot on one side of said body member and adapted to hold a tool, said tool block having a portion extending around one side of said body member, adjusting screws threaded into said extending portion on opposite sides of said pivot, said adjusting screws being adapted to bear against the adjacent side of said body member whereby the tightening of one or the other of said adjusting screws willcause said tool block to swing on its pivot and change the angle between the tool andthe work.

3. A tool-holder for screw machines and the like comprising a body member having a work support, a tool block mounted on an adjustable pivot at one side of said body member and adapted to hold a tool removably secured thereto, said tool block having a flange portion extending along one side of said body member, a pair of adjusting tools and work supports.

screws threaded into the flange portion of adjusting screws will cause the tool block to rotate on its pivot and change the angle between said tool and said work support.

4. A tool-holder for screw machines and the like comprising a body member and a block mounted on a pivot in said body member and having a cutting edge, and adjust able members carried by said block and removable therewith, said adjustable members being adapted to engage the adjacent face of said body member on opposite sides of said pivot whereby adjustment of one or the other of said adjustable members will cause said block to swing onits pivot "and change the angle between its cutting edge and the work.

5. A tool-holder for screw machines and the like. comprising a body member and a tool-supporting member mounted on a pivot in said body member and adapted to hold a tool, and adjustable members carried by said tool-supporting member and removable therewith, said adjustable members being adapted to bear against the adjacent face of said body member on opposite sides of said pivot whereby adjustment of one or the other of said adjustable members will cause the tool-holder to turn on its pivot and change the angle between the tool and the work.

- Signed at Canton, Ohio, this 21st day of Oct., 1919.

IRVIN DROWNS. 

